What you need

a large glass

lemonade (or fizzy water)

peanuts (or raisins)

Instructions

Fill the glass with lemonade.

Stir for 1 min or leave to go slightly flat.

Drop some peanuts into the glass.

Results & explanation

The nuts float up to the top and fall back down again, like in a lava lamp. Gas bubbles grow on the peanuts, making them float upwards. When they reach the top the bubbles burst and the peanuts fall back down again.